Electrode for welding copper and copper alloys



J. WEGRZYN July 21-, 1970 'Fil ed Sept. 13, 1967 v COVERING l4 CORE 1;

w E D O R T E L. E

United States Patent Ofice fzii fliff production technique is similar to the production of 3,521,028 standard steel electrodes. ELECTRODE FOR WELDING COPPER AND Instead of applying double coverings, there are now COPPER ALLOYS provided electrodes with a single pressed covering. The

Jan Wegrzyn, U]. M Strzody 14a/ 14, Gliwice, Poland Filed Sept. 13, 1967, Ser. No. 667,403 5 Claims priority, application Poland, Sept. 15, 1966,

properties of the double covers of known electrodes for the cold welding of copper are now combined in a single covering. This is achieved by the use of new components Int. CL 323k 35/22 which have a better metallurgical physical influence than us, CL z19 14 1 Claim components used in the production of the hitherto used 10 electrodes.

The main components of the covering, which ionize the ABSTRACT OF THE DISCLOSURE arc, are compounds of zirconium such as, for example, A welding electrode consisting of a core of copper or Zlrcomum slhcate amount of up to 20% prefer copper alloy and a covering on the core consisting of ably 5 20% by Welght' Compounds of potassmm and 520% of zirconium silicate, up to 90% of lithium, sonatnum also employed:

dium, potassium or aluminum compounds, such as fluo- The mam e i binding the hydrqgen and scalp rides or fluorosilicates and up to 30% of aluminum or i the Weld agamst oxldatlon are the fluondes and fluoromagnesium or the1ike silicates of, for example, lithium, sodium, potassium or aluminum in an amount of up to 90% by weight.

Exothermic and metallurgical constituents are employed DRAWING stftch as 3a(l)117minum and magnesium powders in amounts 0 up to 0. 5016 figure 18 of an electrodg P The technological process of welding the copper and vlded m accordance Wlth the mvfimloncopper alloys by means of an electrode provided in ac- DETAILED DESCRIPTION cordance with the invention is very simple and similar to the method of welding by means of deep penetrating This invention relates to electrodes for the arc welding Steel electrodes. More particularly, a high voltage are of copper and copper alloys. of up to 45 v. (e.-g. 8, 10 or 12 volts) renders possible The invention more particularly relates to an electrode the deep penetrating method of welding.

10, 0f the type including a core 12 of copper or copper The electrode according to the invention enables the lloy and a thick coating or covering 14 pressed on the making of not only butt welds but also filled welds, these core and containing arc stabilizing components which Welds not requiring either hammering or heat treatment. de-oxidize the weld and protect it against oxygen, bind The efficiency of welding of copper by the use of an the hydrogen and give rise to exothermic reactions. electrode according to the invention is about 30 times The electrode may be used for welding copper and as high as for gas welding. The electrode according to copper alloys by the cold method, as well as after a prethe invention is also adaptable for welding and overliminary heating of the copper. welding of different copper alloys, with brass.

Copper is usually welded by oxy-acetylene welding or The mechanical properties of welds by electrodes acby argon-shielded welding techniques. By means of cording to the invention are similar to those of plastic covered electrodes,'it has thus far been possible to weld 40 worked copper. Also the electric and thermal conductivonly copper parts of insignificant thickness. This has been ity is near the conductivity of copper. The metal deposited due to the lack of suitable copper electrodes for the cold from the copper electrodes according to the invention Welding of sheets of substantial thickness. The first elec- Comprises more than 99.8% Cu. trodes for the cold welding of thick copper parts, de- In the following Table 1, column 1 shows all the comsigned in Poland, substantially simplified the technology ponents used for the coating of the improved electrode. of welding copper but could be used only in limited scope Column 2 shows the percentage ranges of these compodue to the very complicated manner required for producnents. Columns 3, 4, 5, 6 and 7 show exemplary values ing these electrodes and the need for packing them into of components of five different coatings according to the an absolutely tight packing. invention.

TABLE 1 Exemplary values of components of the coatings according to the invention Claimed limits of Components the components I II III IV V Zirconium silicate 5 up to 20% Max. 20% Min. 5% Rest 9% Max. 20% Min. 5%. Fluorides and fluorosilicates of lithium, sodium, Up to Min.50% rest Max. 90% Max. 90% Rest 79% Rest 65%.

potassium and aluminum. Metallic powders of aluminum or magnesium or lup to 30% Max. 30% Best 5% Min. 1% Min. 1% Max. 30%.

their alloys.

Owing to extensive research, an important simplifica As seen in Table l, the lowest range of the amount of tion in the method of producing electrodes for welding fluorides or fluorosilicates in the coating of the improved copper by the cold method has been achieved. At the 65 electrode is 50%. As to the content of metallic powders same time, the quality of the newly developed electrodes of Al or Mg or their alloys, the range is from 1% up according to the invention has been improved. Moreover, to 30%. An electrode with a coating containing less than electrodes provided in accordance with the invention do 1% of metallic powder generally cannot give good weldnot need to be stored in tight packings, and the new ing results.

Table 2 specifies some sizes of the electrodes. and aluminum fluorides and fiuorosilicates and 1 to 30% TABLE 2 The diameter of the core (mm.) 3. 25 4 5 0 I 7 The exterior diameter of the electrode (111111.) 5. 0-5. 2 G. 7-6. 9 8. 4-8. 6 10-1012 11. 7-12. 0 The length of the electrode (mm.) 450 450 450 450 450 The method of production of the electrode according 10 of powders of aluminum or magnesium or alloys thereof.

to the invention is generally known and largely applied in manufacturing pressed electrodes for manual arc weld- References C'ted ing. UNITED STATES PATENTS What is claimed is: 2 731 3 3 1. An electrode for arc welding copper and copper l5 7 H1956 Wasserman et alnnn 148 26 alloys comprising a core of a material selected from the JOSEPH V. TRUHE, Primary Examiner group. conslstmfg of copper. coppei alloys and a L. A. ROUSE, Assistant Examiner covering on said core consisting essentially of 5-20% of zirconium silicate, 50% to 90% of a material selected US. Cl, X.R, from the group consisting of lithium, sodium, potassium 20 219118 

